Door check



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Patented July 16, 1940 UNITED STATES PATENT OFFICE DOOR CHECK EugeneM. Coppola, Des Moines, Iowa Application March 23, 1938, Serial No. 197,670

4 Claims.

, This invention relates to improvements in door checks of that type usually used in connection with spring closed doors, such as screen doors.

I The object of my invention is to provide a simple, durable and inexpensive check which may be easily and quickly applied to the door frame, and when so applied, provide means for cushioning the closing movement of the door just before it reaches its closed position, to prevent undesirable noise and at the same time to reduce the wear and tear on the door frame.

My invention consists in the construction, arrangement and combination of the various parts of the device; whereby the objects contemplated 15 are attained, as hereinafter more fully set forth, pointed out in my claims, andillustrated in the accompanying drawing, in which:

Figure 1 is a side elevation of a segmental portion of a door frame and a segmental section of a spring-actuated door, shown in section, and showing the manner in which my improved door check is supported on the door frame.

. Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a detail sectional view taken on the line 33 of Figure 1.

Figure 4 is an enlarged detail sectional view illustrating the manner in which the shock receiving roller is moved against the brake de- 30 vice.

' Figure 5 is a sectional view of a modified form of my device.

My'impr'oved devicecomprises a base plate I adapted to be secured to the inner face of a door 35 frame II by means of screws I2. Pivotally secured to the base I ii is a rod or arm I 3 having its free end projecting upwardly from a horizontal line and outwardly toward the door memher I 4. Slidably supported on the outer end of the arm I3 is a sleeve I secured in position thereon by means of a screw I6 supported through a slot I! in the sleeve I5 and mounted in the member I3, as clearly illustrated in Figure 3. The slot I'I permits a limited sliding movement of the sleeve relative to the member I3. The outer end of the sleeve I5 is formed with ,a pair of outwardly projecting lugs I8 designed to support a pin I9 on which a rubber roller is rotatably supported, said roller 20 being preferably provided with a metal sleeve or bearing 2| designed to operate on the pin IS. The outer end of the sleeve I5 is provided with an internal annular flange 22, in which is slidably mounted a plunger 23, adapted to serve asa brake device in the manner hereinafter described. The inner end of the plunger 23 is provided with a contracted portion 24 to form a shoulder 25 for receiving a washer .26.

Supported within the inner end of the sleeve I5 is a comparatively large spring 21 having one end rested against the outer end of the member I3 and its other end surrounding the member 24 and resting against the washer 26. Supported around the larger portion of the member 23 is a smaller spring 28, its inner end resting against the washer 26 and its outer end against the annular flange 22.

The plate I B is provided with a bracket 29, which is adjustably supported on the plate by a screw 38, the bracket 29 being designed to support the sleeve I5 at an upwardly and outwardly inclined position, as illustrated in Figure 1, the said screw 30 providing means whereby the inclination of the arm I3 and the sleeve I5 may be adjusted. The position illustrated in solid lines in-Figure 1 is the position that the arm assumes when the door I4 is in its open position of movement, the dotted line showing the arm in position when the door is closed.

The operation of my device is as follows:

Assuming that the door I4 has been moved to anropen position and that the arm I3 has dropped by gravity to the solid line position in Figure 1 and resting on the bracket 29. The sleeve I5 will then be at its outer limit of movement through the action of the springs 21 and 28. If the door is released and allowed to move rapidly to a closed position it will first hit the roller 20 and cause the sleeve I5 to be moved inwardly against the resiliency of the spring 28, until the roller 20 engages the outer end of the member 23, as illustrated in Figure 4. The member 23 will be further moved inwardly against the resiliency of the spring 21, thus providing means for cushioning and absorbing the shock of the door. The frictional contact between the roller 20 and the outer end of the member 23 will prevent the roller from rotating and prevent the free end of the sleeve I5 from travelling upwardly along the inner face of the door. The springs 21 and 28 will then recoil and force the member I5 outwardly, and with it the door I4. The spring carried by the door I 4 will again move the member I5 inwardly a slight distance but with less force than that applied by the original blow. The shock of the door will in this manner be subdued as a number of the above oscillations take place, until the momentum has been reduced to zero. The tension of the springs 21 and 28 is greater than the closing force applied by the door spring so that the roller 20 is then forced outwardly from the outer end of the member 23, as illustrated in Figure 3, at which time the roller will be permitted to rotate and the free end of the sleeve to travel upwardly along the inner face of the door and the door gradually moved to closed position. This gradual closing of the door in its final closing operation is permitted by the arm it moving upwardly from a position slightly inclined from a position perpendicular to the door frame to a position approaching parallelism. By this arrangement the resistance offered to the closing of the door will decrease as the roller ascends the inner face of the door frame.

In Figure I have illustrated a slightly modified form of my construction in which the plunger 23 is eliminated and the member I3 made longer so that its outer end will engage the roller 20, a single spring 3! being provided around the outer end of the member l3 to engage the inner end of the sleeve 32.

In actual practice I find that either of these devices is operatable, the preferred form illustrated in Figures 1, 2, 3 and 4 being more desirable for use in connection with heavier doors. The plate i0 is usually supported substantially half way between the upper and lower end of the door frame. However, it will readily be seen that the device might be supported in a number of different positions on the door frame as desired.

Thus it will be seen I have provided a simple and cheap door check which may be easily and quickly applied and when so applied will act to serve as a shock absorber to subdue the violent closing action of the door and then to permit the door to move gently to its closing position.

J claim as my invention:

1. A door check, comprising a base, an arm pivotally mounted thereon, means forsupport ing said arm in an outwardly inclined position, a roller support slidably mounted on said arm, means for limiting the movement of said roller support, a roller carried by said support adapted to receive the impact of a closing door, yielding means tending to move said support and roller to its outer limit of movement for cushioning the shock of said door, and means adapted to be engaged by said roller when a pre-determined inward movement of the roller support has been accomplished, to frictionally prevent rotation of the roller for the purpose stated.

2. In a device of the class described, the combination of a door frame, a spring closed door supported therein, a door check comprising a base plate fixed to the door frame, an arm pivoted to said base having its free end extending toward the door, adjustable means supporting said arm in an upwardly and outwardly inclined position, a roller support slidably mounted on the free end of said arm, a roller carried in said support adapted to be engaged by the closing door, yieldable means tending to move said roller support outwardly, means for limiting said outward movement, and means adapted to be engaged by said roller as it is moved inwardly by impact from said door to frictionally retain the roller against rotation during the time of said impact.

3. In a device of the class described, the combination of a door casing a spring-actuated door supported in said casing tending to move to closed position, a door check comprising an outwardly extending inclined arm, means pivoting its inner end to said casing, a roller supported to move longitudinally of said arm, yieldable means tending to move said roller outwardly, means for limiting the outward movement of said roller, said roller being adapted to be engaged by said door and to first move inwardly against said yieldable means, and means for engaging and limiting the inward movement of said roller to frictionally retain the roller against rotation and whereby the roller will be released from said check as the door is swung outwardly, by the resiliency of said yieldable means, to permit the roller to rotate and to gradually move upwardly as the door is closed.

l. A door check, comprising a base, an arm pivotally mounted thereon, means supporting said arm in an outwardly extending inclined position, a roller support slidably mounted on said arm, a roller carried by said support adapted.

to receive the impact of a closing door, yielding means tending to move said support and roller to its outer limit of movement, a secondyielding means of higher tension than the first yielding means tending to move the first yielding means and roller support outwardly, and means adapted to be engaged by said roller when the tension of the first yielding means has been overcome and lore-determined movement of the roller support has been accomplished to frictionally prevent rotation of the rollers, for the purpose stated.

EUGENE M. COPPOLA. 

